The document defines key chemistry concepts such as elements, compounds, mixtures, solutions, suspensions, colloids, and separation techniques including distillation, evaporation, and filtration. It also discusses chemical changes and provides examples such as changes in color, temperature, production of gas, or formation of precipitate. Physical and chemical changes are compared. Reactivity and flammability are also addressed. Review questions are included to test understanding.

1. Chapter 2 Material
Keelan Woodard

2. Compound
• A compound is a
substance that is made
from two or more
elements. (H O)
2
• A compound can only be
broken down chemically.

3. Element
• An element is a
substance that cannot be
broken down into
simpler substances.
• Only one capital letter.
(Au)

4. Homogenous Mixture
• The substances are so
evenly distributed, it is
difficult to distinguish
one substance from
another.

5. Heterogenous Mixture
• The parts of the mixture
are noticeably different
from each other.
• Not all the same.

6. Solution
• When substances
dissolve and form a
homogenous mixture, it
is called a solution.
• They do not separate.
They can not be filtered.

7. Suspension
• A suspension is a
heterogenous mixture
that separates.
• “Shake well before use”

8. Colloids
• A colloid contains
particles of different
sizes are evenly
separated in a mixture.

9. Separation Techniques

10. Distillation
• The technique in which
liquids are separated
based on it’s boiling
points.

11. Evaporation
• By evaporating the the
solvent the solute can be
retrieved.

12. Filtration
• Using filter paper to
separate a solid in the
form of powder or
grains from a liquid.
• Such as in the case of
separating a non-soluble
powder from a liquid.

13. 2.3

14. Chemical Change
• When matter undergoes chemical change,
the composition of the matter changes.
When matter undergoes physical change
the composition of the matter will stay the
same.

15. Examples of Chemical
Change
• Change in color.
• Change in temperature.
• Production of gas.
• Formation of precipitate.

16. Flamibility
• Flammability is a
materials ability to burn
in the presence of
oxygen

17. Reactivity
• How readily a substance
combines with other
substances.

18. Questions for Review

19. Tap water is a?
• Element
• Substance
• Compound
• Mixture

20. Name a metal that is
very reactive.

21. Name the example of chemical
change occurring in the photo.

22. What is the chemical
formula for sulfuric acid?

23. Explain why painting iron will
slow down the rate it rusts.